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Real Estate Investments - Mortgage Debt Joint Venture (Details)	9 Months Ended
	Sep. 30, 2022 USD ($) property option	Jan. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Real Estate
Number of properties (property)	379
Seaport Innovation LLC
Real Estate
Aggregate principal amount of mortgage debt | $			$ 620,000,000
Corporate Joint Venture
Real Estate
Number of properties (property)	11
Coupon rate (percent)	3.82%
Debt face amount | $	$ 1,076,625,000
Aggregate principal amount of mortgage debt | $		$ 456,600,000
Seaport Innovation LLC | Corporate Joint Venture
Real Estate
Number of properties (property)	1
Seaport Innovation LLC | Corporate Joint Venture | Massachusetts
Real Estate
Encumbered properties (property)	1
Coupon rate (percent)	3.53%
Debt face amount | $	$ 620,000,000
The LSMD Fund REIT LLC | Corporate Joint Venture
Real Estate
Encumbered properties (property)	9
Number of properties (property)	10
Coupon rate (percent)	3.46%
Debt face amount | $	$ 189,800,000
The LSMD Fund REIT LLC | Corporate Joint Venture | California
Real Estate
Encumbered properties (property)	1
Coupon rate (percent)	4.75%
Debt face amount | $	$ 266,825,000
Number of extension options | option	3
Extension term	1 year
The LSMD Fund REIT LLC | Corporate Joint Venture | California | SOFR
Real Estate
Basis points per annum (as a percent)	1.90%
The LSMD Fund REIT LLC | Corporate Joint Venture | California | SOFR | Interest Rate Cap
Real Estate
Basis points per annum (as a percent)	4.00%

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